Safety-lock.



I PATENT-ED APR. 23,1907. A. JAGOIBSON & E. A. SVBNSSON.

SAFETY LOCK. APPLICATION mum M4! 11. 1906.

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UNITED STATES PA T ENT OFFICE.

SAFETY-LOCK- Specification of Letters Patent.

Patented April 23, 1907.

Application filed. May 11,1906. Serial No. 316,382.

To all whom, it may concern.-

Be it known that we, ALFRED JAcoBsoN, sculptor, and EMANUEL ALBIN SVENssON, joiner, both subjects of the King of Sweden, and gbothjiresiding at Stockholm, Sweden, have invented a certain new and useful Improvement in Safety-Locks, of which the following is a specification.

This invention relates to improvements in safety-locks, and is illustrated by the accompanying drawings, in which Figure 1 is a longitudinal section through the improved lock; Fig. 2, a cross-section corresponding to the line A B in Fig. 1; Fig. 3, an elevation of the movable part of the lock; Fig. 4, an end view of the same. Fig. 5 is a cross-section corresponding to the line C D of Fig. 3, and Fig. 6 shows the key.

The movable part of the lock comprises a sleeve a, provided with two external flanges b and b and connected at its inner end with the lock-bolt, as indicated in dotted lines, Figs. 1 and 8.

Outside the sleeve a are arranged longitudinally-extending bars or levers 0, whose outer ends are movably fixed to the flange b and the inner ends of which enter and are guided by radial grooves formed in the flange b. These inner ends project through the flange 1), Figs. 1 and 3, against which there abuts a fixed part d of the lock-casing, formed with a circular groove 0, Fi 2, into which the projectingends of the ars or levers 0 enter, so that the sleeve (1, together with the bars or levers 0, can be turned round Without being stopped by the fixed part (I or the fixed casing g, surrounding the sleeve (1. Notches f and f are made in the inner or outer Walls of the circular groove 6 opposite to one another and in line with the bars and levers c, Fig. 2, and corresponding to them in width.

The bars or levers c are fixed to the flange b of the sleeve (1 by means of a wire it, Figs. 1 and 3, inserted in a peripheral groove 0 in the flange b and engaging with a corresponding notch in the bars or levers c. Springs 1) and q, bent in a semicircular form, embrace two diametrically opposite bars or levers c and tend to press them against the sleeve a, Figs. 3 and 5.

In the position shown in Fig. 1 the projecting ends of the bars or levers 0 enter the notches f in the inner annular Wall of the groove e, whereby the lock is looked, as the notches f prevent the bars and the sleeve (1 from being turned. In the same manner the lock is locked when the projecting ends of the bars or levers enter the notches f of the outer annular wall of the groove 0.

Opposite to each bar or lever c the wall of the sleeve a is provided with one or more holes receiving balls h, which when caused to project sufiiciently through their holes abut against the bars or levers c and push them from the positions shown in Figs. 1 and 2, so

that their ends are disengaged from the notches f, and the sleeve on can be turned for opening the lock. This releasing operation is performed with the aid of the key 2'. (Shown separately in Fig. 6.) As shown, the key "L is formed as a in, which is adapted to be inserted in the sl eeve a) with its pointed end. The key is provided with a lug or web 1c, intended to engage with a corresponding slot Z, Fig. 4, in the sleeve a, so that the sleeve can be turned by turning the key. Such key is provided with grooves m, corresponding in number, form, and size to the balls h in such a way that the balls h, when the key is inserted in the sleeve a and the web is is engaging the slot Z, engage said grooves 'm in the key'i and are elevated to such an extent that the ends of the bars or levers c are just disengaged from the notches f without being engaged in the notches f, and so that they will enter the groove 6 and permit the sleeve a to be turned and the lock to be opened.

The arrangement described facilitates a multitude of variations for establishing a safety-lock. For this purpose the balls h may be placed at different points of the sleeve 0 opposite to the corresponding bars or levers 0, each such position corresponding to a different displacement of the balls for disengaging the ends of the bars or levers c from the notches f, or for a similar purpose balls h of different sizes may be used.

More than one ball h may be used opposite to each bar or lever c, diflering in sizes and arranged at different distances from one another. Moreover, the number of the bars or levers 0 may be varied, as also may the distances they are arranged from one another around the sleeve a. In each of these cases the notches m of the key i must be made to exactly correspondin size and position to the balls b, so that each notch m will elevate the corresponding ball h just enough to disengage the bar or lever c from the notch f, for if only one of the bars or levers is notfully disengaged or if it is elevated too much, so as to enter the opposite notch f, the sleeve a is prevented from being turned and the lock will remain locked.

The key i is very simple and its smooth surface must be regarded as a great advantage. Its cross-section may be round, polygonal, or it may comprise a tube, the inner surface of the sleeve a being correspondingly formed. Its insertion in the sleeve is very easy, and if the web 7c does not at once engage the notch 1 it will do so when the key is turned. The bars or levers 0 may each be fulcru'med at its middle portion instead of at one end and be arranged to engage annular grooves e in fixed parts of the lock-casing at both ends. Small cylinders or oblique cones or prismatic pieces may be substituted for the balls h, the grooves m of the key being correspondingly formed. Such balls, cones, or the like may also be entirely dispensed with. In this case the bars or levers c are placed in longitudinal slots in the wall of the sleeve (1, so as to engage directly with the key "L by means of projecting parts of the bars or levers c and corresponding grooves of the key.

Having now particularly described, and ascertained the nature of the said invention and in what manner the same is to be performed, we declare that what we claim is 1. In safety-locks, the combination with a central sleeve adapted to receive a key, of longitudinal bars on the outer periphery of the sleeve and engaging in radial notches formed in the annular walls of a concentric groove in the fixed lock-casing, and means cooperating with the key for disengaging the bars from said notches.

2. In safety-locks, the combination with a central sleeve adapted to receive a key, of longitudinal bars on the outer periphery of in the walls of said groove, adapted to engage with the juxtaposed ends of the bars, and means cooperating with the key for disengaging the bars or levers from said notches.

4. In safety-locks a casing, a central sleeve in said casing, connected with the lock-bolt, and adapted to receive a key, bars on the sleeve, an end portion of said casing, provided with a concentric groove and radial notches in the walls of said groove adapted to engage with the ends of the bars and balls, loosely inserted in holes in the wall of the sleeve and adapted to cooperate with the key for disengaging the bars from the notches.

5. In safety-locks a fixed casing, a central sleeve in said casing, connected with the lock-bolt, locking-bars, resting in radial notches formed in an exterior flange of said sleeve and pressed against the sleeve by springs, an end portion of said casing, provided with a concentric groove and radial notches adapted to engage with the juxtaposed ends of the bars, balls, inserted in holes in the wall of the sleeve and cooperating with notches in the key for disengaging said bars.

In testimony whereof we have aflixed our signatures in presence of two witnesses.

ALFRED JACOBSON.

EIWANUEL ALBIN SVENSSON. Witnesses:

VVALDEMAR BOMAN,

T. EKEBOHM. 

